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By the sensitivity of the headphones, you can predict the volume level developed by the headphones at any chosen frequency with the known supply voltage to the headphones from the amplifier. Three-wave smoothing F.A.Q. is used to eliminate the interference of waves due to the use of a "point" microphone.

The frequency response in RAA is obtained through the reproduction and analysis of a special noise signal with the subsequent generation of an impulse response. The frequency response plot is constructed from the spectrum of the impulse response.

The difference in amplitudes of 6 dB is equivalent to a twofold ratio of signal levels.

Original text in Russian report. You can help with translation via the forum or feedback.

Voltage and Sensitivitycomparison
Determination of the required voltage level from the headphone amplifier and comparison with other models. Comparison of on-line graphs with additional analytics of compatibility with specific amplifiers. In comparison, the required voltage value, which the amplifier should provide for the selected sound pressure, is determined based on the sensitivity value of the Panasonic HJE 120.

Frequency response of Panasonic HJE 120 headphone

Brief information
Graph of frequency response F.A.Q. the shows the balance of the frequency of the headphones (reproduced frequency spectrum) in dB. 0 dB is the average of the amplitude.

The frequency response of the headphones can be represented as the selected equalizer setting in the player, applicable to headphones with a flat sound. Subjective "flatness" is perceived differently from external conditions: the volume level F.A.Q. of the external noise and noise isolation headphones. When connected to an amplifier, the frequency response can change F.A.Q..

The frequency response in RAA is obtained through the reproduction and analysis of a special noise signal with the subsequent generation of an impulse response. The frequency response plot is constructed from the spectrum of the impulse response.

At the amplifier the impedance can be of different sizes and when agreed with the impedance of the headphones, change in the frequency response F.A.Q. to varying degrees. The lower the output impedance of the amplifier and the higher the resistance of the headphones, the smaller the change.

Original text in Russian report. You can help with translation via the forum or feedback.

The lower the impedance of headphones in the low-frequency range, the stronger the low frequencies are weakened. With high-impedance headphones, there is no noticeable change in the frequency response F.A.Q..
Original text in Russian report. You can help with translation via the forum or feedback.

Table of measured characteristics

Variance of frequency response Panasonic HJE 120 depending on the total output resistance of the amplifier with zero resistance and a rise of resistance at low frequencies

Brief informationBrief information
The graph shows the change in the perception of the frequency responseF.A.Q. of the headphones when listening to music with a different loudness relative to the natural level. When listening to headphones at a low volume, the perception of recoil in the low frequency range decreases, and when you listen to it at a high volume, it increases.

According to this graph, you can estimate at what volume the headphones will be perceived more flat.

The perception of the number of low frequencies depends on the volume according to the curves of equal loudness. (ISO 226-2009 Acoustics. Normal equal-loudness-level contours). For the base level, 72 dB SPL (live performance of several instruments with vocals without amplifiers with acoustics) is selected.When you select another base level, the dependence varies slightly and is suitable for almost all levels.

Information for Authors. You can freely use the graphics in your articles with a link to us. If there are difficulties with the interpretation of the graphs, you can ask questions on the feedback or facebook.

Measurements of Panasonic HJE 120 were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Panasonic HJE 120 test was conducted as a black box test, without regard to cost and prestige. This is the basic principle for making measurements, measurement reports and developing tests in RAA.

I believe that it is important to do not make an absolute assessment of the device, but an aggregate assessment when working together with a source amplifier and taking into account external factors. This allows you to effectively reveal the potential of the entire set of devices or to make a more optimal choice of components.